Area Code 603-380 located in PORTSMOUTH, ROCKINGHAM, NH, more detail is as below. Place NPA (Numbering Plan Area) : 603 NXX (Local Number Prefix) : 380 City : PORTSMOUTH County : ROCKINGHAM State : NH (New Hampshire) NXX Use Type : Wireless NXX Intro Version : 1997-04-01 FIPS (Federal Information Processing Standards) : 33015 LATA (Local Access Transport Area) : 122 Rate Center : PORTSMOUTH ZIP Code Count : 0 ZIP Code Frequency : Most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 03801 Other Information NPANXX : 603380 County Population : 0 Switch CLLI (Common Language Location Identifier) : DRRYNHBCCM1 MSA CBSA (Core Based Statistical Area) : Boston-Cambridge-Quincy, MA-NH MSA CBSA Code (Core Based Statistical Area) : 14460 Time Zone : Eastern (GMT -05:00) Observes Daylight Saving Time : Yes Company : NEW CINGULAR WIRELESS PCS, LLC - DC OCN (Operating Company Number) : 4036 Coverage Area Name : PORTSMOUTH Latitude : 43.0735 Longitude : -70.7636 ‹ previous : 603-379 next › : 603-381 Telephone Number List 603-380-0000 ~ 603-380-9999